[Boost-bugs] [Boost C++ Libraries] #13211: BOOST_MAY_ALIAS is not always defined and is not documented

Subject: [Boost-bugs] [Boost C++ Libraries] #13211: BOOST_MAY_ALIAS is not always defined and is not documented
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-09-14 06:15:45

#13211: BOOST_MAY_ALIAS is not always defined and is not documented
------------------------------+--------------------------
 Reporter:  viboes            |      Owner:  John Maddock
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  config
  Version:  Boost 1.65.0      |   Severity:  Problem
 Keywords:                    |
------------------------------+--------------------------
 The issue comes from the fact that BOOST_MAY_ALIAS is not always defined.
 E.g.

 ```
 // Type aliasing hint.
 #if __has_attribute(__may_alias__)
 #  define BOOST_MAY_ALIAS __attribute__((__may_alias__))
 #endif
 ```

 Wondering if  this shouldn't be

 ```
 // Type aliasing hint.
 #if __has_attribute(__may_alias__)
 #  define BOOST_MAY_ALIAS __attribute__((__may_alias__))
 #else
 #  define BOOST_MAY_ALIAS
 #endif
 ```

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13211>
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